body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #f5f5f5;
}

form {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

input[type="file"],
select {
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    padding: 10px 20px;
    border: 0;
    background: #007BFF;
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

button:disabled {
  background-color: grey;
}

.download-button {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  background-color: #007BFF;  /* 按钮的背景色 */
  border: none;
  color: white;  /* 按钮内文字和图标的颜色 */
  padding: 17px 32px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  margin: 30px 2px;
  cursor: pointer;
  border-radius: 50%;  /* 边框半径设为50%就可以变成圆形 */
  box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2), 0 6px 20px 0 rgba(0,0,0,0.19);  /* 阴影效果 */
}

.download-button a {
  color: white;  /* 保证链接文字是白色 */
  text-decoration: none;  /* 去掉链接的下划线 */
}

.download-button {
    display: none;
    /* 其他样式 */
}

.loader {
    display: inline-block;
    position: relative;
    width: 40px;
    height: 40px;
}

.loader div {
    position: absolute;
    top: 18px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: #333;
    animation: loader 0.9s linear infinite;
}

.loader div:nth-child(1) {
    left: 8px;
    animation-delay: 0s;
}

.loader div:nth-child(2) {
    left: 32px;
    animation-delay: -0.4s;
}

.loader div:nth-child(3) {
    left: 56px;
    animation-delay: -0.8s;
}

@keyframes loader {
    0% {
        top: 33px;
        transform: translateX(0);
    }
    50% {
        top: 8px;
        transform: translateX(30px);
    }
    100% {
        top: 33px;
        transform: translateX(60px);
    }
}

.hide {
    display: none;
}
.show {
    color: green;
    display: block;
    margin-top: 20px;
}